package com.dooleen.common.core.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class UrlUtil {
	  /** 
	* 向指定 URL 发送POST方法的请求 
	* 
	* @param url 发送请求的 URL 
	* @param param 请求参数 
	* @return 所代表远程资源的响应结果 
	*/
	public static String sendPost(String url, Map<String, ?> paramMap) { 
	   PrintWriter out = null; 
	   BufferedReader in = null; 
	   String result = ""; 
	     
	   String param = ""; 
	Iterator<String> it = paramMap.keySet().iterator(); 
	  
	while(it.hasNext()) { 
	  String key = it.next(); 
	  param += key + "=" + paramMap.get(key) + "&"; 
	} 
	  
	   try { 
	     URL realUrl = new URL(url); 
	     // 打开和URL之间的连接 
	     URLConnection conn = realUrl.openConnection(); 
	     // 设置通用的请求属性 
	     conn.setRequestProperty("accept", "*/*"); 
	     conn.setRequestProperty("connection", "Keep-Alive"); 
	     conn.setRequestProperty("Accept-Charset", "utf-8"); 
	     conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); 
	     // 发送POST请求必须设置如下两行 
	     conn.setDoOutput(true); 
	     conn.setDoInput(true); 
	     // 获取URLConnection对象对应的输出流 
	     out = new PrintWriter(conn.getOutputStream()); 
	     // 发送请求参数 
	     out.print(param); 
	     // flush输出流的缓冲 
	     out.flush(); 
	     // 定义BufferedReader输入流来读取URL的响应 
	     in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); 
	     String line; 
	     while ((line = in.readLine()) != null) { 
	       result += line; 
	     } 
	   } catch (Exception e) { 
		   log.error(e.getMessage()); 
	   } 
	   //使用finally块来关闭输出流、输入流 
	   finally{ 
	     try{ 
	       if(out!=null){ 
	         out.close(); 
	       } 
	       if(in!=null){ 
	         in.close(); 
	       } 
	     } 
	     catch(IOException ex){ 
	       ex.printStackTrace(); 
	     } 
	   } 
	   return result; 
	 } 
	//发送get 请求
	public static String get(String url, String param) {
		String result = "";
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
			// System.out.println(urlNameString);
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
			/*
			 * for (String key : map.keySet()) { System.out.println(key + "--->" +
			 * map.get(key)); }
			 */
			// 定义 BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			log.error("发送GET请求出现异常！{}", e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;
	}
}
